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There is a new GTX3076R that just came out that could be a very sweet turbo in the right situation. (Larger than a GT30 and smaller than a GT35) It's sweet spot is closer to 1 bar on an easy breathing EFI build.
It is has one of the newest generation of Forged compressor wheels that is lighter and flows more air for its size.
Are you running a Turbonetics 60-1 turbo?
If so it's compressor map looks like a good fit for a low boost build like yours. If the hot side is sized right and you have an ok exhaust system it should be at .6 bar boost by 3k easy. Even without the BB option.
Turbonetics also look's to have the newest tec forged-wheel 60-1 and 62-1 compressor wheels that might be something to look into.
When looking at a compressor map you probably want to look at about the 1.7 to 1.8 line for an EFI .6 bar turbo. The old 60 and 62-1 turbo's were in there sweet spots in that range.
Most the GT's and other aftermarket turbo's are in the middle of there peak efficiency island at about 1 bar or higher and just do not look on the surface like a very good fit on a low boost build.
You might check with Protomotive and see what they recommend these days for low boost. They used to be the king in that area.
Not an expert, just my two cents.
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